Experimental study on a gas-solid counter-flow moving bed filter
In order to investigate the influence of operating conditions on the filtration performance of gas-solid countercurrent moving bed filters.Effects of collecting particle circulation flux,inlet dust concentration,superficial gas velocity and inlet dust particle size on the filtration performance of a gas-solid counter-flow moving bed filter were investigated by large cold-mode experiments.The experimental results show that the superficial gas velocity is the main factor determining the filter pressure drop with a positive correlation tendency.The variations of collecting particle circulation flux,inlet dust concentration and dust particle size have less effects on the filter pressure drop.The particle flux and inlet dust concentration present a positive correlation with the pressure drop.The effects of particle size varies with time.The particle size of the dust is positively correlated to the pressure drop at beginning whereas it decreases in the stable period.The dust removal efficiency of the equipment shows a positive correlation with the inlet dust concentration and the particle circulation flux,while the opposite is true with the dust particle size and the superficial gas velocity.The trend of higher filtration efficiency with smaller dust particle size is affected by filtration cake in the filter,which happens at the median dust diameter above 10 μm and the inlet dust concentration from 0 to 32 g·m-3.The filter has high dust removal efficiency with stable pressure drop.Under the conditions of particle circulation flux 0.3119 kg·s-1 and inlet dust concentration 16.5-32.7 g·m-3,the dust removal efficiency reaches 99%,and the efficiency for small dust(less than 13 μm)is 99.9%.
moving bed filterfiltrationtwo-phase flowdust removal efficiencypressure drop
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